Flat or flats may refer to:

Architecture

Apartment An apartment (American English, Canadian English), flat (British English, Indian English, South African English), tenement (Scots English), or unit (Australian English) is a self-contained housing unit (a type of residential real estate) that ...

, known as a flat in the United Kingdom, Ireland, and other Commonwealth countries

Arts and entertainment

Flat (music) In music, flat means lower in pitch. It may either be used in a general sense to mean any lowering of pitch, or to specifically refer to lowering pitch by a semitone. A flat is the opposite of a sharp () which indicates a raised pitch in the sa ...

, a symbol () which denotes a lower pitch * Flat (soldier), a two-dimensional toy soldier made of tin or plastic * Flat (theatre), a flat piece of theatrical scenery * Flat, a leading type of wordplay, as identified by the National Puzzlers' League * '' Flat!'' (2010), an Indian film * Flats (band), an English band * Flats (comics), the first stage in the comic coloring process

Footwear

* Flats, footwear which is not high-heeled * Ballet flats, derived from ballet shoes, for casual wear as well as dancing * Ballet shoes (also known as ballet slippers), often referred to as "flats" or "flat shoes" * Racing flats, lightweight shoes used primarily for running a race

Geography

Landforms

Flat (landform) A flat is a relatively level surface of land within a region of greater relief, such as hills or mountains, usually used in the plural. The term is often used to name places with such features, for example, Yucca Flat or Henninger Flats. ''Flat' ...

, a relatively level area within a region of greater relief *

Mudflat Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal ...

, intertidal wetland with a substrate of fine sediments

Bodies of water

* Flat, a shallow water area in the context of

boating Boating is the leisurely activity of travelling by boat, or the recreational use of a boat whether powerboats, sailboats, or man-powered vessels (such as rowing and paddle boats), focused on the travel itself, as well as sports activities, suc ...

fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from the natural environment (Freshwater ecosystem, freshwater or Marine ecosystem, marine), but may also be caught from Fish stocking, stocked Body of water, ...

marine biology Marine biology is the scientific study of the biology of marine life, organisms that inhabit the sea. Given that in biology many scientific classification, phyla, family (biology), families and genera have some species that live in the sea and ...

, often used in plural form **

Brewster Flats Cape Cod Bay is a large bay of the Atlantic Ocean adjacent to the U.S. state of Massachusetts. Measuring below a line drawn from Ocean Bluff-Brant Rock, Massachusetts, Brant Rock in Marshfield to Race Point Lighthouse, Race Point in Provinceto ...

, an area of Cape Cod Bay off the shore of Massachusetts, U.S. ** Kentish Flats Offshore Wind Farm, off the coast of Kent, England ** Rhyl Flats, a wind farm off the coast of North Wales * Flat coast, a shoreline where the land descends gradually into the sea

Places

United States

* Flat, Alaska, a census-designated place * Flat, Kentucky, an unincorporated community * Flat, Missouri, an unincorporated community * Flat, Texas, an unincorporated community * Flat Brook, a tributary of the Delaware River in Sussex County, New Jersey * Flats, Nebraska, United States * Flats, West Virginia, an unincorporated community *

Forest Lake Area Trail System The ultimate goal of the Forest Lake Area Trail System (FLATS) is to develop a trail system connecting Kirksville and Thousand Hills State Park. The first phase of the trail is a ten-foot wide concrete trail between the Petroglyph Site and Marina ...

, Missouri

Other

* Flat, Puy-de-Dôme, a commune in the French region of Auvergne * Flat Island (disambiguation), in various places * Flat Islands (disambiguation), in Canada and Antarctica * Flat River (disambiguation), in the United States and Canada

Mathematics and geometry

Flat (geometry) In geometry, a flat is an affine subspace, i.e. a subset of an affine space that is itself an affine space. Particularly, in the case the parent space is Euclidean, a flat is a Euclidean subspace which inherits the notion of distance from it ...

, the generalization of lines and planes in an ''n''-dimensional Euclidean space * Flat (matroids), a further generalization of flats from linear algebra to the context of matroids *

Flat module In algebra, flat modules include free modules, projective modules, and, over a principal ideal domain, torsion-free modules. Formally, a module (mathematics), module ''M'' over a ring (mathematics), ring ''R'' is ''flat'' if taking the tensor prod ...

in ring theory *

Flat morphism In mathematics, in particular in algebraic geometry, a flat morphism ''f'' from a scheme (mathematics), scheme ''X'' to a scheme ''Y'' is a morphism such that the induced map on every Stalk (sheaf), stalk is a flat map of rings, i.e., :f_P\colon \ ...

in algebraic geometry *

Flat space In mathematics, curvature is any of several strongly related concepts in geometry that intuitively measure the amount by which a curve deviates from being a straight line or by which a surface deviates from being a plane. If a curve or sur ...

, a space with zero curvature * Flat sign, for its use in mathematics; see

musical isomorphism In mathematics—more specifically, in differential geometry—the musical isomorphism (or canonical isomorphism) is an isomorphism between the tangent bundle \mathrmM and the cotangent bundle \mathrm^* M of a Riemannian or pseudo-Riemannian ...

, mapping vectors to covectors

People

Nickname

* Earl "Flat" Chase (1910–1954), Canadian baseball player * Flat Walsh (1897–1959), Canadian ice hockey goaltender

Fictional characters

* Flat Eric, a character in some Levi's commercials * '' Flat Stanley'', namesake of an American children's book series

Groups

* FLATS or First Lady Astronaut Trainees, American women who underwent NASA Project Mercury physiological screening tests

Other uses

* Flat (gridiron football), the area of the gridiron football field * Flat butterflies or flats, certain skipper butterfly genera in subfamily

Pyrginae Pyrginae, commonly known as spread-winged skippers, are a subfamily of the skipper butterfly family (biology), family (Hesperiidae). The subfamily was established by Hermann Burmeister in 1878. Their delimitation and internal systematics has chan ...

: ** ''

Calleagris ''Calleagris'' is a genus of skipper (butterfly), skippers in the family Hesperiidae. Species *''Calleagris hollandi'' (Butler, 1897) *''Calleagris jamesoni'' (Sharpe, 1890) *''Calleagris kobela'' (Trimen, 1864) *''Calleagris krooni'' Vári, 197 ...

'' (scarce flats), ** '' Celaenorrhinus'' of tribe Celaenorrhinini; ** '' Eagris'', and ** '' Tagiades'' (water flats, snow flats), of tribe Tagiadini * Flat (USPS), an oversized letter * Optical flat, an extremely flat piece of glass